4000 Series Logic ICs : The 4081 Quad 2 Input AND Gate

[@AdamWelchUK]

A perfectly timed calm tutorial to make me think of something logical. Thank you David.

[@saysphilippe]

Great example. More of these videos please. We need to boost the electronic knowlegde in these isolated times.

[@jerril42]

Thanks David. I've been messing with the 74LS series. Some of the 4000 series and 74LS/HC chips have the same function, I'd assumed that they mostly performed more complex functions. Wikipedia helped to explain what's going on. Great demo, and explaining some real world applications.

[@TheEmbeddedHobbyist]

Getting a video out while we are still to leave the house via the internet. Boris has now given me plenty of time to get on with some more video's nice old school video.

[@cript3109]

Thanks you saved my life!

[@SimpleElectronics]

what are the odds? I just ordered some of these the other day....dont know how efficient the postal system is going to be these days though!

[@namratasingh5697]

Good video on AND gate operation, i have some quarry related to AND gate If there is no signal (not connected to any where even not from ground too) at one in put but biasing of IC is done then what will be its output.

[@hollowneedles]

When they have to turn 2 keys to launch a nuke, there's a 4081 handling the handshake, right? ;)

[@DigicoolThings]

Nicely done. But you do know that 4000 series CMOS are only rated for around 1ma max sink/source on outputs. eg. With a 5V supply you’re possibly sourcing 5ma driving that LED directly. Just saying. :)

[@DavidWatts]

It was around 3.6v from 3 NiMh AA batteries and the LED has a forward voltage of 3.2v so roughly 0.9mA current through the LED.

[@DigicoolThings]

@@DavidWatts Nice. Perhaps you could add some more detail on this in part 2? I'd hate for your students to hook up there own circuit with a red LED (eg. ~1.9Vfwd) and power up wondering why the circuit only flashed once, then was forever logic zero! :)